Class

Description

  datetime.date

Represent Gregorian Calendar.

  datetime.time

Represent time as an hour, minute, second, microsecond, and time zone.

  datetime.datetime

The combination of date class and time class. Represents the information of year, month, day, hour, minute, second, microsecond, and time zone.

  datetime.timedelta

Represent the variation between two dates or time.

  datetime.date

  datetime.date class represents Gregorian Calendar.

        ㆍ Constructor : datetime.date(Year, Month, Day)

        ㆍ Year : 1~9999

        ㆍ Month : 1~12

        ㆍ Day : 1~ the last day of months.

  Example)

       import datetime

       DT = datetime.date(2014, 1, 1)

       print(DT)

       >> 2014-01-01

       #If an invalid value entered, it occurs an error.

       #datetime.date must enter all parameters. If not, it occurs an error.

   The property of datetime.date.

   Example)

       import datetime

       DT = datetime.date(2014, 1, 1)

       print(DT.year)

       >> 2014

       print(DT.month)

       >> 1

       print(DT.day)

       >> 1

       DDay = datetime.date.today()

       print(DDay)

       >> 2014-02-04

       #The Integer returned by weekday() are 0(Monday), 1(Tuesday), 2(Wednesday), 3(Thursday), 4(Friday), 5(Saturday), 6(Sunday).

       Week = datetime.date.today()

       print(Week.weekday())

       >> 1

  datetime.time

  datetime.time class represents the time of an hour, minute, and second.

        ㆍ Constructor : datetime.time(Hour, Minute, Second)

        ㆍ Hour : 0~23 Hour

        ㆍ Minute : 0~59 Minute

        ㆍ Second : 0~59 Second

  Example)

       import datetime

       a = datetime.time(23)

       print(a)

       >> 23:00:00

       a = datetime.time(23,59)

       print(a)

       >> 23:59:00

       a = datetime.time(23,59,59)

       print(a)

       >> 23:59:59

       #If an invalid value entered, it occurs an error.

  The property of datetime.date

  Example)

       import datetime

       tm = datetime.time(10, 15, 20)

       print( tm.hour )

       >> 10

       print( tm.minute )

       >> 15

       print( tm.second )

       >> 20

  datetime.datetime

  datetime.datetime class represents a year, month, day, hour, minute, second.

        ㆍ Constructor : datetime.datetime(Year, Month, Day, Hour, Minute, Second)

        ㆍ Year : 1~9999 Year

        ㆍ Month : 1~12 Month

        ㆍ Day : 1~the last day of months

        ㆍ Hour : 0~23

        ㆍ Minute : 0~59

        ㆍ Second : 0~59

        ㆍ Create the datetime object by taking each parameter as an Integer number. You can't omit the year, month, day. If hour, minute, second is omitted, reset to zero.

  Example)

       import datetime

       a = datetime.datetime(2014, 1, 1)

       print(a)

       >> 2014-01-01 00:00:00

       a = datetime.time(2014, 12, 31, 23)

       print(a)

       >> 2014-12-31 23:00:00

       #If an invalid value entered, it occurs an error.

  The property of datetime.date.

  Example)

       import datetime

       tm = datetime.datetime(2014, 12, 31, 10, 15, 20)

       print( tm.year )

       >> 2014

       print( tm.month )

       >> 12

       print( tm.day )

       >> 31

       print( tm.hour )

       >> 10

       print( tm.minute )

       >> 15

       print( tm.second )

       >> 20

       tm = datetime.datetime.today();

       print( tm )

       >> 2014-02-26 16:53:44.095000

       #today() obtains by millisecond, it obtains the local time(Desktop time).

       tm = datetime.datetime(2014, 12, 31, 10, 15, 20)

       print(tm.weekday())

       >> 2

       #It is the same as weekday in date class.

       tm = datetime.datetime(2014, 12, 31, 10, 15, 20)

       dt = tm.date();

       print(dt)

       >> 2014-12-31

       dt = tm.time();

       print(dt)

       >> 10

  datetime.timedelta

  datetime.timedelta class represents the variation between two dates or time. If the parameter is a positive number, it represents forward from the current point, If it is a negative number, it represents backward from the current point.

        ㆍ Constructor : datetime.timedelta(weeks, days, hours, minutes, seconds)

  Parameters of datetime.timedelta.

  datetime.timedelta is used to change the time of time information object made by datetime class.

  Example)

       import datetime

       tm = datetime.datetime(2014, 12, 31, 10, 15, 20)

       dt = tm.date();

       print(tm)

       >> 2014-12-31 10:15:20

       # Enter weeks 3 to the timedelta class, and save the information of 3weeks.

       tm = datetime.datetime(2014, 12, 31, 10, 15, 20)

       tm = tm - datetime.timedelta(weeks=3) Subtract 3weeks from the current time.

       print(tm)

       >> 2014-12-10 10:15:20

       # Enter weeks -3 to the timedelta class, and save the information of -3weeks.

       tm = datetime.datetime(2014, 12, 31, 10, 15, 20)

       tm = tm + datetime.timedelta(weeks=-3) Add -3weeks to the current time.

       print(tm)

       >> 2014-12-10 10:15:20

       # Enter days 5 to the timedelta class, and save the information of 5days.

       tm = datetime.datetime(2014, 12, 31, 10, 15, 20)

       tm = tm + datetime.timedelta(days=5) Add 5days to the current time.

       print(tm)

       >> 2015-01-05 10:15:20

       # Enter hours 1 to the timedelta class, and save the information of an hour.

       tm = datetime.datetime(2014, 12, 31, 10, 15, 20)

       tm = tm + datetime.timedelta(hours=1) Add an hour to the current time.

       print(tm)

       >> 2014-12-31 11:15:20

       # Enter minute 11 to the timedelta class, and save the information of 11minutes.

       tm = datetime.datetime(2014, 12, 31, 10, 15, 20)

       tm = tm - datetime.timedelta(minutes=11) Subtract 11minutes from the current time.

       print(tm)

       >> 2014-12-31 10:04:20

       # Enter seconds 29 to the timedelta class, and save the information of 29seconds.

       tm = datetime.datetime(2014, 12, 31, 10, 15, 20)

       tm = tm + datetime.timedelta(seconds=29) Add 29seconds to the current time.

       print(tm)

       >> 2014-12-31 10:15:49